That number hasn't stopped rising since. Facebook said Thursday that 10,000+ websites add the Like Button every day — identical to what COO Sheryl Sandberg said in October last year. In other words, the growth of the Like button hasn't slowed down in the past six months. The social network says more than 2.5 million websites have integrated with Facebook so far, including more than 80% of the top 100 websites in the U.S.

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